Plants growing at the bottom of giant sinkholes in China ... a new study finds. The sinkholes, called "tiankeng," are some of the last-remaining natural refuges for ancient forests and may harbor ...

More than 100 metres (328ft) beneath them is a lost world of ancient forests, plants and animals ... revealed new treasures - and turned China’s sinkholes into a tourist attraction.

Deep in China's Fengjie County lies a natural wonder that has fascinated experts for decades. The Xiaozhai Tiankeng sinkhole is vast. Probably formed centuries ago by collapsing caves and ...